In a crackdown on online child exploitation, Japanese police have arrested 111 people.

According to Japan’s National Police Agency, 111 individuals between the ages of 14 and 68 were arrested during a nationwide crackdown on online child sexual exploitation that took place in February and March.

The operation, which focused on crimes involving online child pornography and sexual abuse, was the first time Japan had taken part in a coordinated international investigation with five other nations, including South Korea, Singapore, and Hong Kong.

According to the agency, some of the arrests in Japan were made using information exchanged through international cooperation, demonstrating the value of cross-border cooperation in combating online child exploitation.

The joint investigation was carried out from Feb. 24 to March 28, bringing about the apprehension of a total of 544 individuals aged 13 to 68 across Japan and other nations and region, the agency added.

The arrests in Japan stemmed from cases including the public display and possession of child pornography. Among the 111 apprehended were high school teachers, preparatory school lecturers and company employees, along with teenage students.

The agency said it will continue to strengthen international cooperation in an effort to crack down on such crimes.